diff --git a/SQL/202510/20251030/bpm_process_instance_ext.sql b/SQL/202510/20251030/bpm_process_instance_ext.sql
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index 0000000..91de5ef
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+++ b/SQL/202510/20251030/bpm_process_instance_ext.sql
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+-- 达梦数据库新增字段脚本
+-- 功能：为表BPM_PROCESS_INSTANCE_EXT新增ASSIGNEE字段
+
+-- 检查字段是否已存在
+DECLARE
+    v_column_count NUMBER;
+BEGIN
+    -- 查询系统表检查字段是否存在
+    SELECT COUNT(*) INTO v_column_count
+    FROM ALL_TAB_COLUMNS
+    WHERE TABLE_NAME = 'BPM_PROCESS_INSTANCE_EXT'
+      AND COLUMN_NAME = 'ASSIGNEE';
+
+    -- 如果字段不存在，则执行添加操作
+    IF v_column_count = 0 THEN
+        EXECUTE IMMEDIATE 'ALTER TABLE BPM_PROCESS_INSTANCE_EXT ADD ASSIGNEE TEXT';
+        DBMS_OUTPUT.PUT_LINE('字段ASSIGNEE添加成功');
+    ELSE
+        DBMS_OUTPUT.PUT_LINE('字段ASSIGNEE已存在，无需重复添加');
+    END IF;
+END;
+/
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